Steps to Create a Cladogram Ascaris – A parasitic roundworm, it is the most primitive among the group (no backbone).Shark – A cartilaginous fish, it has a backbone but lacks limbs.Frog – An amphibian, it has a backbone and can live both in water and on land.Bird – A vertebrate with feathers and the ability to fly.Rat – A mammal with fur, warm-blooded, and gives birth to live young.